Magnus Chase was fighting Lindworms in Hotel Valhalla with Thomas Jefferson Jr., Mallory Keen, Halfborn Gunderson, and new einherji Alex Fierro. However, Grimwolf, one of the oldest lindworms, suddenly appears on the battle field. Alex suspects that Loki sent him here and cuts its head off with her garrote while Magnus distracted Grimwolf.
Lindworms were the size and lengths of eighteen-wheelers. They only have two front legs and leathery brown bat-type wings.
- While lindworms in the books have wings, most portrayals in original mythology portray them as just snakes with arms. There are, however, some portrayals of them with wings in the original stories.
- It's assumed that they could be controlled by Loki, as Alex suspect that he sent them. If that's true it's possible that Loki is the god of snakes & serpents (and fire wyrms sometimes). So, he can possibly be included as the god of lindworms and dragons too. Although, supposedly he is not immune to their venom.
- Nidhogg is often portrayed as a Lindworm in ancient art. While it is unknown if he is considered one in the Magnus Chase novels, the fact that the Lindworms are said to originate in the roots of the World Tree, where Nidhogg makes his home, implies that they are connected to him.